Lasius is a genus of formicine ants. The type species for this genus is the black garden ant, Lasius niger. Other major members, which live in drier heathland, are the cornfield ant, L. neoniger, and L. alienus. Other species include the temporary social parasites of the L. mixtus group and the hyper-social parasite Lasius fuliginosus. Lasius flavus is also a commonly seen species, building grassy hillocks in undisturbed pasture. In the Alps, these mounds – always aligned east to catch the first rays of the rising sun – have been traditionally used by goatherds as natural compasses. Species in the subgenus Acanthomyops, in particular L. interjectus and L. claviger, are commonly known as citronella ants due to their citronella-like smell.
Tetramorium atratulum is a rare workerless socially parasitic ant from the Palaearctic region, which has even been introduced together with its host in North America. This extreme inquiline is represented only by female and pupoid type male individuals, whose morphology and anatomy indicate a highly specialized level of parasitism. The body of males is depigmentated, the cuticle is thin, the petiole and postpetiole are widely connected, and degenerate mandibles, palps, and antennae are observed. Female wing venation is reduced and the occipital region is narrowed. Mature females are typically physogastric and found in queenless host nests.
The black garden ant, also known as the common black ant, is a formicine ant, the type species of the subgenus Lasius, which is found across Europe and in some parts of North America, South America, Asia and Australasia. The European species was split into two species; L. niger, which are found in open areas; and L. platythorax, which is found in forest habitats. It is monogynous, meaning colonies contain a single queen.
Ant mimicry or myrmecomorphy is mimicry of ants by other organisms; it has evolved over 70 times. Ants are abundant all over the world, and potential predators that rely on vision to identify their prey, such as birds and wasps, normally avoid them, because they are either unpalatable or aggressive. Some arthropods mimic ants to escape predation, while some predators of ants, especially spiders, mimic them anatomically and behaviourally in aggressive mimicry. Ant mimicry has existed almost as long as ants themselves; the earliest ant mimics in the fossil record appear in the mid-Cretaceous alongside the earliest ants.
Leptothorax pocahontas is a threatened species of ant endemic to Alberta, Canada, facing a high risk of extinction.
Phengaris rebeli, common name mountain Alcon blue, is a species of butterfly in the family Lycaenidae. It was first found and described in Styria, Austria, on Mount Hochschwab around 1700. Although it was initially classified as a subspecies of P. alcon, a European researcher, Lucien A. Berger, designated it as a separate species in 1946. Genetic similarities between P. rebeli and P. alcon have led many researchers to argue that the two are the same species and differences are due to intraspecific variation.
Lasius murphyi is a species of ant in the genus Lasius. It is endemic to the United States and Canada.
Camponotus universitatis is a species of ant in the genus Camponotus, the carpenter ants. It is native to Eurasia, where it has been recorded in Spain, France, Italy, Switzerland, Albania, Bulgaria, and Turkey.
Formica talbotae is a species of ant in the subfamily Formicinae. It is native to the United States. It is named after entomologist Mary Talbot. It is a species of inquiline workerless parasites that take over nests who have recently lost their queens.
Lasius reginae is a species of ant in the genus Lasius. It is native to Austria.
Myrmecia inquilina is a species of ant endemic to Australia in the subfamily Myrmeciinae, first discovered in 1955 and described by Athol Douglas and William Brown Jr. in 1959. These ants are large, measuring 21.4 millimetres (0.84 in). During the time of its discovery, Douglas and Brown announced M. inquilina as the first social parasite among the primitive subfamilies, and today it is one of the two known Myrmecia species to have no worker caste. Two host species are known, Myrmecia nigriceps and Myrmecia vindex. Aggression between M. inquilina and its host species does not occur, and colonies may only produce M. inquilina brood months after the inquiline queens begin to lay their eggs. Queens eat the colony brood or trophic eggs, and other Myrmecia species may kill M. inquilina queens if they reject them. Due to its restricted distribution and threats to its habitat, the ant is "vulnerable" according to the IUCN Red List.
Pogonomyrmex anergismus is a species of workerless inquiline ant in the subfamily Myrmicinae native to Arizona, New Mexico, and Texas that parasitizes Pogonomyrmex rugosus and Pogonomyrmex barbatus nests.
Pogonomyrmex colei is a species of workerless inquiline ant in the subfamily Myrmicinae native to California, Nevada, and Arizona that parasitizes Pogonomyrmex rugosus nests.
Lasius neglectus is a polygynous, sometimes invasive, ant of the genus Lasius. The ant was identified in 1990 after establishing a colony in Budapest, Hungary. Superficially, they are similar in appearance to the common black garden ant, Lasius niger, but have significantly different behavioural patterns, particularly in the social structure within colonies.
Lasius alienus, or cornfield ant, is a species of ant in the subfamily Formicinae. Workers have a length of about 2–4 mm, Queens are larger (7–9 mm).
Lasius balearicus is an ant species from the genus Lasius. It was discovered in 1982 by Cedric Alex Collingwood, an entomologist from the Royal Entomological Society and described as a new species in 2014 after a team from the Institut de Biologia Evolutiva in Barcelona collected the holotype in 2008. L. balearicus is confined to the island of Majorca and it is the first known endemic ant species from the Balearic Islands and the first known endemic Lasius species from any Mediterranean island.
Symphiles are insects or other organisms which live as welcome guests in the nest of a social insect by which they are fed and guarded. The relationship between the symphile and host may be symbiotic, inquiline or parasitic.
